Casting mold ejector



May 17, 1932. w. M. LESTER CASTING MOLD 'EJECTOR Filed March 19, 1931 2 Sheets-Sheet l wrzzz'on .Mle my.

May 17, 1932. w. M. LESTER CASTING MOLD EJECTOR Filed March 19. 1951 2 Sheets-Sheet 2 v 7/77 10: I? Zewlr- I K 7 W WW Patented May 17, 1932 UNITED STATES PATEN OFFICE.

WILLIAM M. LESTER, OF SHAKER HEIGHTS, OHIO cAs'riNG MoLn EJ'ECTOR Application filed March .19, 1931.

' of the ejector will not be dependent on the length of stroke of the half of the die in which the ejector operates to provide a construction in which there will be no necessity for introducing a series of levers to increase the motion of the ejector and to provide a simple and con venient operating mechanism for the ejector that will always give it a sufiiciently large stroke to be sure to discharge the casting.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings, in which I Fig. 1 is a side view partly in section of part of a die casting machine showing a preferred embodiment of this invention;

Fig. 2 is a vertical sectional view through the valve mechanism for the ejector, and

Fig. 3 is a view like Fig. 1 showing the parts in a different position.

Only a part of the machine is shown herein but enough to illustrate the fact that ordinarily in a die casting machine the ejector, which is carried by a plate which carries half of the die, has to come back to impinge upon a stationary element of the machine to operate it for the purpose of ejecting the casting. This sometimes makes it necessary to draw back this die further than is necessary to separate the die parts; also it limits the motion of the ejection to a. portion of the motion of the die or else it necessitates the use of a rather elaborate lever system.

In this case the machine is shown as comprising two die members and 11, the member 11 being placed against, and supported by, the stationary member 12 of the frame of the machine. This is connected by rods 13 to a stationary member 14. There is a sliding member 15 carrying the die 10 movable up to casting position as shown in Fig. 1 and back to ejecting position as shown in Fig. 3. In the latter position there must be enough space between the members 10 and 11 to allow the casting to be discharged and ejected out. Heretofore the ejector 16 has been carried in Serial N0. 523,839.

the member 15 and brought back to engage the member 14 or some other stationary part. In that case the ejector ordinarily moves far enough to dislodge the casting but it has been V necessary to move the member 15 further than is now considered necessary.

The operation of the machine is the same as has been the case heretofore. Oil or other fluid is admitted throu h a sup-ply pipe 17 to one side of a piston 18 located in a cylinder 19. This forces the piston rod 20 and a slide 21 with which it is connected over to the position shown in Fig. 1, which is the casting position. The member 15, which is carriedby the slide, is as far to the right at this time as it ever gets. To open the mold fluid is admitted through a pipe 22 to the other side of the piston 18 and the parts moved to the position shown in Fig. 3. j

The ejecting means consists of a cylinder 24 having a piston 25 therein, the ejector 16 being the piston rod. This cylinder acts the same as the cylinder 19. A valve casing 26 is provided having an admission pipe 27 for oil or other fluid and a discharge pipe 28. In this valve casing 26 is a multiple valve 29 having a rod 30 connected with an operating stem 31 which is provided with a-shoulder 32 and is guided in the member 14. A spring 33 is provided'to return the stem 31 to left-hand position. 7

The valve 29 comprises a plurality of valves which open and close the ports from the inlet pipe 27 and to the outlet pipes 28 on one side. They also open and close ports to the two pipes 34 and 35 which extend into the cylinder 24 at the opposite sides of the piston 25. Now'in this case assuming the mold to be closed as shown in Fig. 1 and oil admitted through the pipe 22 to the cylinder 19, the

member 15 will move to the left with the die section 10. There will be no ejecting of the casting until the shoulder 32 abuts against the member 14. Then the valves 29 will be shifted. Previous to this there has been pressure on the piston 25 in the direction of the arrow in Fig. 1 to hold the ejector back and the pipe 34 has .beenopen to the exhaust. Now the valve 29 has been shifted and the pipe 35 opened to the exhaust while the pipe 34 is connected to the supply pipe 27. Now the piston 25 moves to the right and necessarily moves throughout its full amplitude and the ejector is forced out as shown in Fig. 3. The casting thus is freed entirely from the mold and drops out by gravity.

In this casea slight motion of the stem 31 is suflicient to change the valves andwhen the shoulder 32 moves forward away from the member 14: the spring 33 will reverse these valves and withdraw'the ejector. before the mold is closed. There is no dependence on a system of levers and the action of the-ejector is not restricted by the length of motion of the member 15. The cylinder 24; can be made as long as may be desired without any revision of the stroke of the machine.

. Although I have illustrated and described only one form of the invention I am, aware of the fact that modifications can be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims. Therefore I do not wish to be limited in this respect but what I do claim is v 1. In a die casting machine, the combination with a movable element for reciprocating one member of the die, a cylinder carried by said element, a piston in the cylinder having a rod constituting the ejector, a valve casing carried by said element having a stem provided with a shoulder, whereby, when the casingis moved back until the shoulder engages a stationary part of the machine, the valve will be shifted thereby, and means for then introducing a fluid behind the piston to proj eat the ejector.

2. In a die casting machine, the combination with a movable element for reciprocating one member of the die, acylinder carried by said element, a piston in the cylinder having a rod constituting'the ejector, .a valve casing mounted on said movable element and having a valve stem providedwith a shoulder wherebywhen the movable element is moved back until the shoulder engages a stationarypart of the machine, the valve will be shifted thereby, means for then introducing a fluid behind thepiston to project the ejector, and a spring bearing on the valve stem at one end and at the other on a part carried by the mov-- a cylinder, apiston in the cylinder having a rod constituting the ejector for said mold, a

valve casing movable with said mold part and having a valve stem provided with a shoulder, whereby, when the stem is moved untilTthe shoulder'engages a stationary part of the-machine, the valvewill' be shifted'thereby, said valve constituting means for then introducing a fluid behind the-piston to project the ejector and means for moving the movable mold part to bring the shoulder into contact with said stationary part for the purpose WILLIAM M. LESTER. 

